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#include <camellia/errno.h>
#include <kernel/arch/amd64/driver/driver.h>
#include <kernel/arch/amd64/driver/util.h>
#include <kernel/arch/amd64/interrupts.h>
#include <kernel/arch/amd64/port_io.h>
#include <kernel/panic.h>
#include <kernel/proc.h>
#include <kernel/vfs/request.h>
#include <shared/mem.h>
static const int PS2 = 0x60;
static volatile uint8_t kb_buf[64];
static volatile ring_t kb_backlog = {(void*)kb_buf, sizeof kb_buf, 0, 0};
static volatile uint8_t mouse_buf[64];
static volatile ring_t mouse_backlog = {(void*)mouse_buf, sizeof mouse_buf, 0, 0};
static void accept(VfsReq *req);
static void ps2_irq(void);
static VfsReq *kb_queue = NULL;
static VfsReq *mouse_queue = NULL;
static void wait_out(void) {
while ((port_in8(PS2 + 4) & 2) != 0);
}
static void wait_in(void) {
while ((port_in8(PS2 + 4) & 1) == 0);
}
void ps2_init(void) {
uint8_t compaq;
wait_out();
port_out8(PS2 + 4, 0x20); /* get compaq status */
wait_in();
compaq = port_in8(PS2);
compaq |= 1 << 1; /* enable IRQ12 */
compaq &= ~(1 << 5); /* enable mouse clock */
wait_out();
port_out8(PS2 + 4, 0x60); /* set compaq status */
wait_out();
port_out8(PS2, compaq);
wait_out();
port_out8(PS2 + 4, 0xD4);
wait_out();
port_out8(PS2, 0xF4); /* packet streaming */
wait_in();
if (port_in8(PS2) != 0xFA) { /* check ACK */
panic_unimplemented();
}
irq_fn[IRQ_PS2KB] = ps2_irq;
irq_fn[IRQ_PS2MOUSE] = ps2_irq;
vfs_root_register("/ps2", accept);
}
static void ps2_irq(void) {
for (;;) {
uint64_t status = port_in8(PS2 + 4);
if (!(status & 1)) break; /* read while data available */
if (status & (1 << 5)) {
ring_put1b((void*)&mouse_backlog, port_in8(PS2));
postqueue_ringreadall(&mouse_queue, (void*)&mouse_backlog);
} else {
ring_put1b((void*)&kb_backlog, port_in8(PS2));
postqueue_ringreadall(&kb_queue, (void*)&kb_backlog);
}
}
}
enum {
H_ROOT,
H_KB,
H_MOUSE,
};
static void accept(VfsReq *req) {
// when you fix something here go also fix it in the COM1 driver
int ret;
switch (req->type) {
case VFSOP_OPEN:
if (reqpathcmp(req, "/")) ret = H_ROOT;
else if (reqpathcmp(req, "/kb")) ret = H_KB;
else if (reqpathcmp(req, "/mouse")) ret = H_MOUSE;
else ret = -ENOENT;
vfsreq_finish_short(req, ret);
break;
case VFSOP_READ:
if ((long __force)req->id == H_ROOT) {
const char data[] = "kb\0mouse";
ret = req_readcopy(req, data, sizeof data);
vfsreq_finish_short(req, ret);
} else if ((long __force)req->id == H_KB) {
postqueue_join(&kb_queue, req);
postqueue_ringreadall(&kb_queue, (void*)&kb_backlog);
} else if ((long __force)req->id == H_MOUSE) {
postqueue_join(&mouse_queue, req);
postqueue_ringreadall(&mouse_queue, (void*)&mouse_backlog);
} else panic_invalid_state();
break;
default:
vfsreq_finish_short(req, -1);
break;
}
}
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